When opening an existing Liana Connect wallet, the balance shows 0 BTC before reloading

[nondiremanuel]

Both opening a Liana Connect wallet already in datadir and adding an existing wallet from scratch, for an instant the balance is shown to be 0 BTC. After an instant, the page reloads and the correct balance is shown.

The update is almost instant, so it's not a big deal, but maybe we could improve it in the future (e.g. by not showing zero but some other "idle" or "loading" status).